Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable, allowance	$ 252,000	$ 260,000
Fixed assets, accumulated depreciation	$ 381,000	$ 366,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	800,000,000	800,000,000
Common stock, issued (in shares)	102,232,943	101,258,135
Common stock, outstanding (in shares)	102,232,943	101,258,135